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From |
elisabetta capobianco <elisabetta.capobianco@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: example about choice experiment datasheet |

Date |
Tue, 27 Nov 2012 06:31:44 +0100 |

Dear Arne, you're my very helpful, thank you so much. Now i'm trying to use mix logit, I've ridden your article. It seems to be better than asclogit, because i have different alternatives on N choices occasion. Is it more correct for my case, isn't it? Thank you! elisabetta 2012/11/26 Arne Risa Hole <arnehole@gmail.com>: > This is to be expected; if you found it surprising you need to read > the -asclogit- manual entry more carefully. Whether it's correct or > not really depends on what you are trying to do. I would suggest that > including socio-demographics in your model only makes sense if you > interact them with the alternative-specific attributes, since your > alternatives are unlabelled. > > Arne > > On 26 November 2012 10:43, elisabetta capobianco > <elisabetta.capobianco@gmail.com> wrote: >> Ok Arne, >> now It's clear and I have had good results. >> Just a doubt. When I put inside the socio-demographic variables, the >> output has the four alternatives 1,2,3,4, even if I write nocons. >> I don't understand the meaning of this output considering that I have >> unlabelled alternatives. >> Is however correct this result? >> >> Thank you, >> Elisabetta >> >> >> >> >> >> 2012/11/24 Arne Risa Hole <arnehole@gmail.com>: >>> Elisabetta, >>> >>> The "case" variable must a unique identifier for each choice. You can >>> generate it like this >>> >>> egen caseid = group(id scenario) >>> >>> The "alt" variable should be coded 1,2,3,4,1,2,3,4 etc. (not >>> 1,2,3,4,5,6,7,8,...). >>> >>> Arne >>> >>> On 24 November 2012 16:04, elisabetta capobianco >>> <elisabetta.capobianco@gmail.com> wrote: >>>> Thank you Arne, I have taken the book. >>>> My problem is that I have 16 scenarios for id (n=131) with 4 different >>>> alternatives for each scenario . >>>> So in the dataset I have written for each id non 4 alternatives >>>> (1,2,3,4) but 64 alternatives. Is it correct? >>>> >>>> >>>> >>>> id scenario alt >>>> 1 1 1 >>>> 1 1 2 >>>> 1 1 3 >>>> 1 1 4 >>>> 1 2 5(or1?) >>>> 1 2 6(or2?) >>>> 1 2 7(or3?) >>>> 1 2 8 (or4?) >>>> 1 3 9(or1?) >>>> . >>>> . >>>> . >>>> . >>>> . >>>> 1 16 64 >>>> 2 1 1 >>>> . >>>> . >>>> And when I wrote: >>>> asclogit choice organic price, case(id) alternatives(car) noconst >>>> >>>> case is id or scenario? I suppose scenario. But if is scenario I don't >>>> know how to use id! >>>> And alternatives are the 64 alternatives? >>>> >>>> >>>> Thank you so much for your help. >>>> >>>> elisabetta >>>> >>>> >>>> >>>> >>>> >>>> 2012/11/23 Arne Risa Hole <arnehole@gmail.com>: >>>>> Elisabetta >>>>> >>>>> I am fairly sure that you can use -asclogit- to do what you want. If >>>>> you don't want alternative-specific constants you can use the >>>>> -noconst- option. Modifying the example in the help-file slightly: >>>>> >>>>> webuse choice >>>>> asclogit choice dealer, case(id) alternatives(car) noconst >>>>> >>>>> As you can see the only coefficient which is estimated in this case is >>>>> the one for the dealer attribute, which is analogous to the organic >>>>> and price attributes in your experiment. In your case the variable >>>>> that identifies the alternatives for each case ("car" in the example) >>>>> can simply take the values 1, 2, 3 and 4 since your alternatives are >>>>> unlabelled. >>>>> >>>>> I also recommend taking a look at a basic choice modelling text before >>>>> proceeding, such as >>>>> http://books.google.co.uk/books/about/Applied_Choice_Analysis.html?id=8yZrtCCABAgC. >>>>> >>>>> Good luck! >>>>> >>>>> Arne >>>>> >>>>> On 23 November 2012 13:25, elisabetta capobianco >>>>> <elisabetta.capobianco@gmail.com> wrote: >>>>>> I think that asclogit is not the right comand for me. >>>>>> Because I have 4 unlabeled alternatives, 16 diferrent scenarios with 4 >>>>>> alternatives for 131 individuals. So my indipendent viariables are the >>>>>> attributes and dipendent variables the utility for each level of >>>>>> attribute. >>>>>> I need to know the importance of every level, not of alternatives. >>>>>> Ex.:n=131 >>>>>> scenario 1) A B C D >>>>>> organic org no org no org org >>>>>> price 4 8 4 4 >>>>>> scenario 2) A B C D >>>>>> organic no org no org org no org >>>>>> price 12 16 8 8 >>>>>> . >>>>>> . >>>>>> . >>>>>> Perhaps with mixlogit? Because the example is on a specific >>>>>> alternative, car or bus. >>>>>> I instead need to know the coefficient of attributes and levels. >>>>>> >>>>>> I don't know if I have explained well, I hope! >>>>>> >>>>>> e >>>>>> >>>>>> >>>>>> >>>>>> 2012/11/23 Arne Risa Hole <arnehole@gmail.com>: >>>>>>> -help asclogit_postestimation- >>>>>>> >>>>>>> Arne >>>>>>> >>>>>>> On 23 November 2012 11:05, elisabetta capobianco >>>>>>> <elisabetta.capobianco@gmail.com> wrote: >>>>>>>> Dear Arne, >>>>>>>> i need to estimate the marginal effect of levels on attributes of my choice. >>>>>>>> Is it possible? >>>>>>>> es: >>>>>>>> about meat: >>>>>>>> attribute level >>>>>>>> label organic/not organic >>>>>>>> origin local abroad >>>>>>>> prize 4/8 >>>>>>>> >>>>>>>> I would know the utility for each level of each attribute. >>>>>>>> >>>>>>>> Thank you! >>>>>>>> elisabetta >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> 2012/11/21 elisabetta capobianco <elisabetta.capobianco@gmail.com>: >>>>>>>>> Thank you so much Arne!!! >>>>>>>>> I'm creating the data set and then i'll try to run in Stata! >>>>>>>>> >>>>>>>>> Elisabetta >>>>>>>>> >>>>>>>>> 2012/11/20 Arne Risa Hole <arnehole@gmail.com>: >>>>>>>>>> Elisabetta >>>>>>>>>> >>>>>>>>>> -mlogit- is not very useful to model data from choice experiments as >>>>>>>>>> it does not allow alternative-specific explanatory variables. >>>>>>>>>> -asclogit- requires your data to be in long form (one row per >>>>>>>>>> alternative); see -help asclogit- and the first example in the paper I >>>>>>>>>> mentioned in my last email. >>>>>>>>>> >>>>>>>>>> Arne >>>>>>>>>> >>>>>>>>>> On 20 November 2012 10:04, elisabetta capobianco >>>>>>>>>> <elisabetta.capobianco@gmail.com> wrote: >>>>>>>>>>> Thank you Arne, I want to use asclogit and mlogit for my choice modelling. >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> 2012/11/19 Arne Risa Hole <arnehole@gmail.com>: >>>>>>>>>>>> Elisabetta >>>>>>>>>>>> >>>>>>>>>>>> As Jay says the correct data form depends on the estimation command >>>>>>>>>>>> you are planning to use, so this is a very important piece of >>>>>>>>>>>> information that you haven't given us. You may find the examples in >>>>>>>>>>>> http://www.stata-journal.com/article.html?article=st0133 useful. >>>>>>>>>>>> Generally speaking the best strategy is to import the data into Stata >>>>>>>>>>>> and then use commands like -reshape- to convert the data into the form >>>>>>>>>>>> you want, rather than trying to do this in Excel. >>>>>>>>>>>> >>>>>>>>>>>> Arne >>>>>>>>>>>> >>>>>>>>>>>>> On 19 November 2012 15:51, elisabetta capobianco >>>>>>>>>>>>> <elisabetta.capobianco@gmail.com> wrote: >>>>>>>>>>>>>> >>>>>>>>>>>>>> Thank you for your answer! >>>>>>>>>>>>>> I want to do a mixed logit, but I have found a data set on help file >>>>>>>>>>>>>> with just one choice set. I have 16 choice sets and I don't know how >>>>>>>>>>>>>> to fil the excel data set. >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> 2012/11/18 JVerkuilen (Gmail) <jvverkuilen@gmail.com>: >>>>>>>>>>>>>> > On Sun, Nov 18, 2012 at 4:11 AM, elisabetta capobianco >>>>>>>>>>>>>> > <elisabetta.capobianco@gmail.com> wrote: >>>>>>>>>>>>>> >> Hi, I'm new of statalist and stata! >>>>>>>>>>>>>> >> I'm working on choice experiment about food preferences in schools. >>>>>>>>>>>>>> >> I have 4 alternatives unlabelled, 4 attributes and 4 levels, 130 >>>>>>>>>>>>>> >> individuals. >>>>>>>>>>>>>> >> I have the data base in excel, but before insheet the file in stata >>>>>>>>>>>>>> >> i'm not sure that i have put the data in the right mode in the excel >>>>>>>>>>>>>> >> file. >>>>>>>>>>>>>> >> Have you got an example on a excel datasheet about choice modelling? >>>>>>>>>>>>>> >> Just an example to understand how to organize my datasheet. >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > It depends on what analysis you want to use. -clogit- and procedures >>>>>>>>>>>>>> > like it that are using alternative-specific predictors use the same >>>>>>>>>>>>>> > basic format, which is specified in the help file. You can see the >>>>>>>>>>>>>> > example dataset there. Essentially it is a "long" format like >>>>>>>>>>>>>> > person-period in a growth model with time-varying covariates. >>>>>>>>>>>>>> > * >>>>>>>>>>>>>> > * For searches and help try: >>>>>>>>>>>>>> > * http://www.stata.com/help.cgi?search >>>>>>>>>>>>>> > * http://www.stata.com/support/faqs/resources/statalist-faq/ >>>>>>>>>>>>>> > * http://www.ats.ucla.edu/stat/stata/ >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> -- >>>>>>>>>>>>>> Rispetta l'ambiente: se non ti è necessario, non stampare questa mail >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> Le informazioni contenute in questa comunicazione e gli >>>>>>>>>>>>>> eventuali documenti allegati >>>>>>>>>>>>>> >>>>>>>>>>>>>> hanno carattere confidenziale e sono a uso esclusivo del >>>>>>>>>>>>>> destinatario. Nel caso >>>>>>>>>>>>>> >>>>>>>>>>>>>> questa comunicazione Vi sia pervenuta per errore, Vi informo >>>>>>>>>>>>>> che la sua diffusione >>>>>>>>>>>>>> >>>>>>>>>>>>>> e riproduzione è contraria alla legge e prego di darmi >>>>>>>>>>>>>> prontamente avviso >>>>>>>>>>>>>> >>>>>>>>>>>>>> e di cancellare quanto ricevuto. Grazie. >>>>>>>>>>>>>> >>>>>>>>>>>>>> * >>>>>>>>>>>>>> * For searches and help try: >>>>>>>>>>>>>> * http://www.stata.com/help.cgi?search >>>>>>>>>>>>>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>>>>>>>>>>>>> * http://www.ats.ucla.edu/stat/stata/ >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> * >>>>>>>>>>>> * For searches and help try: >>>>>>>>>>>> * http://www.stata.com/help.cgi?search >>>>>>>>>>>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>>>>>>>>>>> * http://www.ats.ucla.edu/stat/stata/ >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> -- >>>>>>>>>>> Rispetta l'ambiente: se non ti è necessario, non stampare questa mail >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> Le informazioni contenute in questa comunicazione e gli >>>>>>>>>>> eventuali documenti allegati >>>>>>>>>>> >>>>>>>>>>> hanno carattere confidenziale e sono a uso esclusivo del >>>>>>>>>>> destinatario. Nel caso >>>>>>>>>>> >>>>>>>>>>> questa comunicazione Vi sia pervenuta per errore, Vi informo >>>>>>>>>>> che la sua diffusione >>>>>>>>>>> >>>>>>>>>>> e riproduzione è contraria alla legge e prego di darmi >>>>>>>>>>> prontamente avviso >>>>>>>>>>> >>>>>>>>>>> e di cancellare quanto ricevuto. Grazie. >>>>>>>>>>> >>>>>>>>>>> * >>>>>>>>>>> * For searches and help try: >>>>>>>>>>> * http://www.stata.com/help.cgi?search >>>>>>>>>>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>>>>>>>>>> * http://www.ats.ucla.edu/stat/stata/ >>>>>>>>>> >>>>>>>>>> * >>>>>>>>>> * For searches and help try: >>>>>>>>>> * http://www.stata.com/help.cgi?search >>>>>>>>>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>>>>>>>>> * http://www.ats.ucla.edu/stat/stata/ >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> -- >>>>>>>>> Rispetta l'ambiente: se non ti è necessario, non stampare questa mail >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> Le informazioni contenute in questa comunicazione e gli >>>>>>>>> eventuali documenti allegati >>>>>>>>> >>>>>>>>> hanno carattere confidenziale e sono a uso esclusivo del >>>>>>>>> destinatario. Nel caso >>>>>>>>> >>>>>>>>> questa comunicazione Vi sia pervenuta per errore, Vi informo >>>>>>>>> che la sua diffusione >>>>>>>>> >>>>>>>>> e riproduzione è contraria alla legge e prego di darmi >>>>>>>>> prontamente avviso >>>>>>>>> >>>>>>>>> e di cancellare quanto ricevuto. Grazie. >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> -- >>>>>>>> Rispetta l'ambiente: se non ti è necessario, non stampare questa mail >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> Le informazioni contenute in questa comunicazione e gli >>>>>>>> eventuali documenti allegati >>>>>>>> >>>>>>>> hanno carattere confidenziale e sono a uso esclusivo del >>>>>>>> destinatario. Nel caso >>>>>>>> >>>>>>>> questa comunicazione Vi sia pervenuta per errore, Vi informo >>>>>>>> che la sua diffusione >>>>>>>> >>>>>>>> e riproduzione è contraria alla legge e prego di darmi >>>>>>>> prontamente avviso >>>>>>>> >>>>>>>> e di cancellare quanto ricevuto. Grazie. >>>>>>>> >>>>>>>> * >>>>>>>> * For searches and help try: >>>>>>>> * http://www.stata.com/help.cgi?search >>>>>>>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>>>>>>> * http://www.ats.ucla.edu/stat/stata/ >>>>>>> >>>>>>> * >>>>>>> * For searches and help try: >>>>>>> * http://www.stata.com/help.cgi?search >>>>>>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>>>>>> * http://www.ats.ucla.edu/stat/stata/ >>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> Rispetta l'ambiente: se non ti è necessario, non stampare questa mail >>>>>> >>>>>> >>>>>> >>>>>> Le informazioni contenute in questa comunicazione e gli >>>>>> eventuali documenti allegati >>>>>> >>>>>> hanno carattere confidenziale e sono a uso esclusivo del >>>>>> destinatario. Nel caso >>>>>> >>>>>> questa comunicazione Vi sia pervenuta per errore, Vi informo >>>>>> che la sua diffusione >>>>>> >>>>>> e riproduzione è contraria alla legge e prego di darmi >>>>>> prontamente avviso >>>>>> >>>>>> e di cancellare quanto ricevuto. Grazie. >>>>>> >>>>>> * >>>>>> * For searches and help try: >>>>>> * http://www.stata.com/help.cgi?search >>>>>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>>>>> * http://www.ats.ucla.edu/stat/stata/ >>>>> >>>>> * >>>>> * For searches and help try: >>>>> * http://www.stata.com/help.cgi?search >>>>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>>>> * http://www.ats.ucla.edu/stat/stata/ >>>> >>>> >>>> >>>> -- >>>> Rispetta l'ambiente: se non ti è necessario, non stampare questa mail >>>> >>>> >>>> >>>> Le informazioni contenute in questa comunicazione e gli >>>> eventuali documenti allegati >>>> >>>> hanno carattere confidenziale e sono a uso esclusivo del >>>> destinatario. Nel caso >>>> >>>> questa comunicazione Vi sia pervenuta per errore, Vi informo >>>> che la sua diffusione >>>> >>>> e riproduzione è contraria alla legge e prego di darmi >>>> prontamente avviso >>>> >>>> e di cancellare quanto ricevuto. Grazie. >>>> >>>> * >>>> * For searches and help try: >>>> * http://www.stata.com/help.cgi?search >>>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>>> * http://www.ats.ucla.edu/stat/stata/ >>> >>> * >>> * For searches and help try: >>> * http://www.stata.com/help.cgi?search >>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>> * http://www.ats.ucla.edu/stat/stata/ >> >> >> >> -- >> Rispetta l'ambiente: se non ti è necessario, non stampare questa mail >> >> >> >> Le informazioni contenute in questa comunicazione e gli >> eventuali documenti allegati >> >> hanno carattere confidenziale e sono a uso esclusivo del >> destinatario. Nel caso >> >> questa comunicazione Vi sia pervenuta per errore, Vi informo >> che la sua diffusione >> >> e riproduzione è contraria alla legge e prego di darmi >> prontamente avviso >> >> e di cancellare quanto ricevuto. Grazie. >> >> * >> * For searches and help try: >> * http://www.stata.com/help.cgi?search >> * http://www.stata.com/support/faqs/resources/statalist-faq/ >> * http://www.ats.ucla.edu/stat/stata/ > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ -- Rispetta l'ambiente: se non ti è necessario, non stampare questa mail Le informazioni contenute in questa comunicazione e gli eventuali documenti allegati hanno carattere confidenziale e sono a uso esclusivo del destinatario. Nel caso questa comunicazione Vi sia pervenuta per errore, Vi informo che la sua diffusione e riproduzione è contraria alla legge e prego di darmi prontamente avviso e di cancellare quanto ricevuto. Grazie. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: example about choice experiment datasheet***From:*Arne Risa Hole <arnehole@gmail.com>

**References**:**st: example about choice experiment datasheet***From:*elisabetta capobianco <elisabetta.capobianco@gmail.com>

**Re: st: example about choice experiment datasheet***From:*"JVerkuilen (Gmail)" <jvverkuilen@gmail.com>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <elisabetta.capobianco@gmail.com>

**Re: st: example about choice experiment datasheet***From:*Arne Risa Hole <arnehole@gmail.com>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <elisabetta.capobianco@gmail.com>

**Re: st: example about choice experiment datasheet***From:*Arne Risa Hole <arnehole@gmail.com>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <elisabetta.capobianco@gmail.com>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <elisabetta.capobianco@gmail.com>

**Re: st: example about choice experiment datasheet***From:*Arne Risa Hole <arnehole@gmail.com>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <elisabetta.capobianco@gmail.com>

**Re: st: example about choice experiment datasheet***From:*Arne Risa Hole <arnehole@gmail.com>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <elisabetta.capobianco@gmail.com>

**Re: st: example about choice experiment datasheet***From:*Arne Risa Hole <arnehole@gmail.com>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <elisabetta.capobianco@gmail.com>

**Re: st: example about choice experiment datasheet***From:*Arne Risa Hole <arnehole@gmail.com>

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